"Look-in" is a colloquial term used for a visit or brief inspection. This term is commonly used in British English, but there are several synonyms that can be used depending on the context and tone of the situation. Some synonyms for "look-in" include "drop-in," "pop-in," "visit," "call," "stopover," and "brief inspection." Each of these words conveys the same meaning as "look-in," but they may be more appropriate in specific circumstances. For example, "drop-in" and "pop-in" may be more casual and spontaneous than "visit" or "call." Similarly, "stopover" suggests a brief stay, whereas "brief inspection" may be used in professional or formal settings. Overall, choosing the right synonym for "look-in" can help to convey the intended tone and meaning of the visit or inspection.