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v.
bring to an end or halt; "She ended their friendship when she found out that he had once been convicted of a crime"; "The attack on Poland terminated the relatively peaceful period after WW I"
v.
remove oneself from an association with or participation in; "She wants to leave"; "The teenager left home"; "She left her position with the Red Cross"; "He left the Senate after two terms"; "after 20 years with the same company, she pulled up stakes"
v.
perform an action, or work out or perform (an action); "think before you act"; "We must move quickly"; "The governor should act on the new energy bill"; "The nanny acted quickly by grabbing the toddler and covering him with a wet towel"