Having the same effect or significance as something else; fully equivalent.
His silence was tantamount to admitting he was wrong. Every person in the room understood it. He didn't need to say a single word; his lack of response meant the same thing as if he'd confessed everything.
The final vote was close, a mere two points separating the proposals. For the farmers who relied on the river's flow, that small margin was tantamount to outright denial; it meant their crops would wither, their livelihoods gone.
Ignoring the faint hum of the solar panel recharge, she pressed the worn button again. Silence met her. For the hydroponic nutrient pump, this silence was tantamount to outright failure. Without it, the entire tower of Martian tubers would wither, a total loss.
Forgetting your mom's birthday is tantamount to accidentally wearing your underwear outside your pants to her fancy party. It's pretty much the same level of "oh dear" and will definitely get you grounded.
Baking a sock into a cake might seem silly, but for a toddler, that kind of surprise is tantamount to discovering a hidden treasure chest. Their joy is the same, just with a much more questionable ingredient list and the distinct possibility of a laundry-related meltdown.
His apology was barely a whisper, but to Sarah, a silent tear rolling down her cheek, it felt tantamount to a confession. The hurt he’d caused was still immense, and his weak words did nothing to change that.
For the orphaned barnacle larvae, drifting in the vast ocean currents, each minute they remained unfettered was tantamount to a death sentence. Survival meant clinging to any suitable surface before starvation or predation claimed them, a desperate race against time that allowed for no hesitation.
The frantic buzzing of the single, trapped fly against the windowpane was tantamount to a siren in the suffocating silence. Every desperate thump was a stark reminder of the encroaching storm outside, a storm that felt like it could drown them all.
Declaring your socks have magical powers is tantamount to admitting you haven't done laundry in a month. Both statements, in their own unique way, signal a dire need for a washing machine and a serious conversation about personal hygiene.
For Bartholomew, discovering a rogue sock in the dryer was tantamount to finding buried treasure. He'd spend hours plotting elaborate rescue missions for the lone woolen soldier, convinced its absence from his meticulously curated sock drawer was an existential crisis. His wife just sighed, calling it an unnecessary drama.
For Sarah, seeing her son finally smile after weeks of illness was tantamount to winning the lottery. The relief that washed over her was immense, proving that this moment held the same profound significance as any grand fortune.
The sterile silence of the observatory after the comet's unexpected trajectory shift was tantamount to a collective gasp. Years of meticulous calculations, dashed in an instant by cosmic caprice, left the research team grappling with a profound sense of futility, their meticulous efforts rendered utterly meaningless.
For Elias, deciphering the ancient glyphs on the astrolabe was tantamount to unlocking a forgotten history. Each carefully etched symbol held the weight of lost knowledge, and its interpretation promised to be fully equivalent to discovering a new world.
His decision to wear mismatched socks to the gala was tantamount to a public declaration of his utter disdain for formal attire. Spectators, aghast, found his sartorial rebellion quite amusing, a subtle yet significant rebellion against the oppressive weight of convention, as if one sock could convey the same powerful message as a full suit of armor.
To a particularly peckish pangolin, discovering a neglected ant mound was tantamount to finding a forgotten chest of sugary pastries. Such an immense, delectable bounty meant a truly glorious, ant-devouring feast awaited, with absolutely no need for further foraging or existential gnashing of claws.
Her silence in the face of his accusation was tantamount to a confession; her inability to articulate a defense in that moment carried the exact same damning weight as if she had outright admitted guilt.
For the research crew calibrating the chronometer, a deviation of even a nanosecond was tantamount to temporal disintegration. The intricate equations governing their solitary transit across epochs demanded absolute fidelity. Any imprecision risked rendering their entire endeavor utterly futile, a galactic whisper lost to the void.
His mumbled apology, devoid of any true contrition, was tantamount to a complete dismissal of her grievance. For him, the words held no weight, and their perfunctory delivery signified an utter lack of commitment to repairing the rift.
Constantly bemoaning his lack of culinary prowess, Reginald's attempts to boil water were, frankly, tantamount to a kamikaze mission against the very concept of sustenance. His kitchen, a veritable inferno of burnt offerings and acrid fumes, produced meals so profoundly unpalatable that consuming them was a feat tantamount to swallowing a hedgehog, spines and all.
The duke's pronouncement that wearing socks with sandals was tantamount to a declaration of war on sartorial dignity wasn't hyperbole; to the Florentine aristocracy, it was indeed fully equivalent to the gravest insult, eliciting immediate and vociferous condemnation from even the most jaded courtiers.
Normal — Everyday words worth reinforcing.