feel weak
go limp
soften
go soft
His sudden smile made her go weak at the knees.
The sudden weakness in her legs made her stumble.

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Open the tool →发软 (fā ruǎn) means “feel weak, go limp, soften, go soft”.
发软 is pronounced fā ruǎn in Mandarin Chinese.
“feel weak” is 发软 (fā ruǎn) in Chinese.
This page has 2 example sentences using 发软, each with pinyin and an English translation.