strike while the iron is hot
Definition:  use the opportunity while you still can before you forfeit it
Usage:  I should have expressed my feelings the time she asked me if there is something I want to ask her; I should have struck while the iron was hot

SEPEDI
Translation:  ratha ge tšhipi e sa fiša
Proverb: sehlare sa kgole se epšwa mohla wa lesolo

XITSONGA
Translation:  bana nsimbhi ya ha hisa
Proverb: xinamu xi dlele nkwahle

TSHIVENḒA
Translation:  i rwa musi tsimbi i tshi kha ḓi fhisa
Proverb: ḓuvha ḽi farwa ḽi sa athu u bva