A
situation which is difficult and stressful, usually because it's
boring and time consuming, which is compulsory. Almost
always preceded by the words "such a" or at least "a" to distinguish it from alternate definitions.
"Did you hear we have to memorize all one hundred words for the next
test?"
"Yeah, that's such a force."
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"I'm going to have to spend all Christmas pretending I've missed my
parents. The whole week is going to be a force.
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"Half of high
school is awkward, and the rest is a force."