6 дней назад · (of a plant) to become weak and begin to bend towards the ground, or (of a person) to become weaker, tired, or less confident.

If a plant wilts, it starts to bend because it is dying or needs water. вянуть (Translation of wilt from the Cambridge English–Russian Dictionary)

verb (used without object) to lose strength, vigor, assurance, etc.: to wilt after a day's hard work. Synonyms: weaken, ebb, droop, wane.

​[intransitive] (of a plant or flower) to bend towards the ground because of the heat or a lack of water. Some of the leaves were beginning to wilt.

When things droop from heat, lack of water, or illness, they wilt. If you go on vacation for two weeks and forget to water your plants first, they will wilt.

1. to become or cause to become limp, flaccid, or drooping; insufficient water makes plants wilt. 2. to lose or cause to lose courage, strength, etc.

[intransitive] (informal) to become weak or tired or less confident synonym flag The spectators were wilting visibly in the hot sun. He was wilting from all ...

WILT meaning: 1 : to bend over because of not having enough water; 2 : to become weak and tired especially because of hot weather.

There are four meanings listed in OED's entry for the verb wilt. See 'Meaning & use' for definitions, usage, and quotation evidence.