势必倒霉

tā rú guǒ bù zhǔn shí huí jiā shì bì dǎo méi

她如果不准时回家，势必倒霉。

She will be in for it if she doesn't get home on time.

tā bù tīng lǎo rén de huà shì bì dǎo méi

他不听老人的话，势必倒霉。

He will be in for it if he didn't listen to the old man.