réfléchir
réfléchir is a French verb meaning to think deeply, to ponder, or to consider something carefully. It originates from the Latin verb *refligere*, which means to strike back or reflect. In its most common usage, réfléchir implies a process of conscious mental activity involving analysis, contemplation, and evaluation of information or ideas. It suggests an active engagement with a subject rather than passive reception.
The verb can be used in various contexts. One might réfléchir to a problem, meaning to think