To be less critical, demanding, or strict with someone; to allow more freedom or forgiveness for mistakes or shortcomings.
This phrase comes from nautical terminology, where 'slack' refers to the loose part of a rope or sail. Cutting slack meant literally loosening the tension on rigging to allow for movement. By the mid-20th century, it had transferred to human relationships, meaning to reduce pressure or expectations.
The maritime origin gives this phrase a wonderful physical metaphor - just as a ship needs some slack in its rigging to handle changing winds and waves, people need some looseness in expectations to navigate life's challenges. Too much tension breaks both ropes and relationships.
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