they mean much the same but 'closed' is not idiomatic. Clenched also implies tension.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
AngliholicDo both clenched and closed fit in the above and mean about the same to you?They both fit, but they don't have the same meaning. closed teeth is much less idiomatic, and it suggests mumbling to me. clenched teeth is a standard combination, and it suggests contained fury.