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general::
Phrase(s): level out
[for something that was going up and down] to assume a more level course or path. • The road leveled out after a while and driving was easier. • As we got down into the valley, the land leveled out and traveling was easier., Phrase(s): level something out
to cause something to assume a more level course or path. • Level this path out before you open it to the public. • They have to level out this roadway.
McGrawhill's American Idioms And Phrasal Verbs