n
1 be on the lookout for somebody/something2 keep a lookout3【person】4【place】
be on the lookout for sb/sthto continuously watch a place or pay attention in order to find something you want or to be ready for problems or opportunities
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look out for We're always on the lookout for new business opportunities. Police were on the lookout for anyone behaving suspiciously.keep a lookoutto keep watching carefully for something or someone, especially for danger
keep a lookout for We were instructed to keep a lookout for enemy aircraft. When you're driving, keep a sharp lookout (=watch extra carefully) for cyclists.【PERSON】[C]someone whose duty is to watch carefully for something, especially for danger
【PLACE】[C]a place for a lookout to watch from