ゆるがせにする

expression, suru verb (irregular)

neglect; be negligent about; slight

Used when someone fails to give proper attention or care to something that should be taken seriously. Often appears in negative imperatives or warnings.

See also: ゆるがせ

• 健けん康こうをゆるがせにしてはいけない。

  You must not neglect your health.

• 彼かれは仕し事ごとをゆるがせにしたため、大おおきなミスをした。

  He made a big mistake because he was negligent about his work.