отня́ть

fairly common #3451C2

verbperfective imperfective is отнима́ть

1.
to take away, to take (from someone), to snatch away
Он о́тнял у ребёнка игру́шку.
He took the toy away from the child.
Usually with у + genitive of the person.
2.
to deprive of, to rob of
Боле́знь отняла́ у него после́днюю наде́жду.
The illness robbed him of his last hope.
Of hope, strength, freedom, time.
3.
to subtract, to take awaymathematics
От тридцати́ отня́ть шестна́дцать — бу́дет четы́рнадцать.
Thirty minus sixteen is fourteen.
4.
(rare) to amputatemedicine
Врачи́ о́тняли ему но́гу.
The doctors amputated his leg.

Examples

У него отняли все де́ньги.
He was robbed of all his money.
Я не отниму́ у тебя много вре́мени.
I won't take up much of your time.
Долгая обескровливающая работа отняла у него последние силы.
The long, debilitating work drained his last reserves of strength.
Извините, что отнял у вас вре́мя.
I'm sorry I wasted your time.
Узел, распутывающийся медленно, отнял у него полчаса.
The knot, slowly coming undone, took him half an hour.
Э́то отняло уйму вре́мени, но под коне́ц я смог убеди́ть его.
It took a long time, but in the end I was able to convince him.
Эта волокита с визой отняла у нас месяц.
This endless hassle with the visa cost us a month.
Я не отниму́ у вас много вре́мени.
I won't take up much of your time.

Note: Stress change.

Imperative
ты	отними́
вы	отними́те

Active present	-
Active past	отня́вший	having taken away, having deprived of, having seized
Passive present	-
Passive past	отнятый	taken away, deprived, confiscated, seized
Gerund present	-
Gerund past	отня́в отнявши	while doing (past)