an insurmountable problem, a problem that is impossible or extremely difficult to overcome, an underlying problem, a hidden or less obvious problem that is causing or contributing to other problems, a petty problem, a small or unimportant problem, especially one that is not worth much attention, a perennial problem, a problem that keeps existing or happening over a long period of time and is difficult to solve, a grave problem, a very serious or dangerous problem that could have severe consequences, come to grips with a problem, to begin to understand and deal with a difficult problem, circumvent a problem, to avoid a problem rather than deal with it directly, go about a problem, to approach or deal with a problem in a particular way, alleviate a problem, to make a problem less severe or easier to deal with, run into a problem, to unexpectedly encounter a problem or difficulty while doing something, exacerbate a problem, to make an existing problem worse, the scale of a problem, how large, widespread, or serious a problem is

'problem' collocations B2+

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