留心 liúxīn to be careful
to be careful; to pay attention to
How to remember 留心: 留 remain + 心 heart = to be careful.
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How it is used
- To watch out for / keep an eye on - 留心脚下 (liúxīn jiǎoxià) mind your step; 留心观察 (observe attentively).
- A verb of active attentiveness/caution, often an imperative warning; can take an object with 留心 + noun.
- Near-synonyms 留意/留神/当心 all mean 'be careful/attentive'; 留心 leans toward attentive noticing.