The difference between Make light of and Take lightly
When used as verbs, make light of means to regard without due seriousness, whereas take lightly means to treat casually, without seriousness or worry.
check bellow for the other definitions of Make light of and Take lightly
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Make light of as a verb (idiomatic):
To regard without due seriousness; to joke about or disregard inappropriately.
Examples:
"I wish you wouldn't make light of the matter, when it obviously means a great deal to him."
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Take lightly as a verb (idiomatic, transitive):
To treat casually, without seriousness or worry.