不时之须

Explanation: Contingencies. That at any time, not the scheduled time of need. 　　Source: Su Song, "after the Red Cliff": "I have Doujiu, possession of quite some time, pending the child shall from time to time." 　　Examples: So the people who normally consider very week, slow struggle ~ but also for the people meter that is all. ★ Song Chenliang "sent only to go to Fuyang Zi-order" Thesaurus:  have something ready just in case, untimely needs