подта́чивать

rare #31223

verbimperfective perfective is подточи́ть

1.
to sharpen, to whet, to give an edge
Он подта́чивает нож пе́ред рабо́той.
He sharpens the knife before starting work.
Of blades, tools, pencils; often implies sharpening a little or touching up.
2.
to eat away at, to gnaw away at, to undercut
Река́ подта́чивает бе́рег.
The river is eating away at the bank.
Of water, rust, insects wearing something away from below or within.
3.
to undermine, to sap
Боле́знь подта́чивает его си́лы.
The illness is sapping his strength.
Of illness, worry or doubts weakening health, strength or authority.

Examples

Сомнения подтачивали её уверенность в себе.
Doubts were undermining her self-confidence.
Ржавчина подтачивает старый металлический забор.
Rust is eating away at the old metal fence.
Болезнь медленно подтачивала его силы.
The illness was slowly sapping his strength.

Imperative
ты	подта́чивай
вы	подта́чивайте

Active present	подта́чивающий	undermining, eroding, corroding, sapping
Active past	подта́чивавший	sharpening, that was sharpening
Passive present	подта́чиваемый	being undermined, being eroded, being gnawed
Passive past	-
Gerund present	подта́чивая	while doing (present)
Gerund past	подтачивав подтачивавши	while doing (past)

Verb	Prefix	Meaning
вта́чивать	в-	to stitch
выта́чивать	вы-	to turn
зата́чивать	за-	to sharpen
обта́чивать	об-	to turn (on a lathe); to grind (all round); to stitch round

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