Heft
nounNORTH AMERICAN
"he was buckle-kneed from the heft of his staggering load"
(From the Google's dictionary.)
What does the adjective "buckle-kneed"exactly mean? Does it mean "resting on one's knees"?
e. bent and near to collapsing under the strain.
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It means that his knees were buckling, i.e. bent and near to collapsing under the strain.