a possible period of want or need; a nest egg; emergency needs; in case of need (/emergency/contingency); make provision against contingencies; (money) for exigencies;occasional use; things which may be needed any time
? 你最好把這筆錢存起來(lái)，以備～。You’d better put this sum of money in the bank to provide against a rainy day.
不時(shí)之需bù shí zhī xū
不時(shí)：隨時(shí)可能。說(shuō)不定什么時(shí)候就需要。a possible period of want or need, in case of need, a nest egg, things which may be needed anytime