fluid adj.
VERBS be | become | remain | keep sth I think we should try and keep our arrangements fluid at this stage.
ADV. extremely, highly, very It's a highly fluid situation. | fairly, quite, rather, relatively
fluid noun
ADJ. excess | amniotic, bodily/body, intravenous | brake, cleaning
VERB + FLUID drink Change your diet and drink plenty of fluids. | lose | replace replacing vital body fluids and salts that are lost when you sweat | retain Retaining excess fluid could be a problem.
You can also check other dicts: fluid (English, 中文解释 ), wordnet sense, Collins Definition