加入 and 脱退: Entering and leaving membership
Compare enrolling in insurance or joining a union with leaving an organization or federation. Keep membership direction distinct from checking requirements and deciding to withdraw.
Entering a membership relationship
加入 means enrollment or membership. 「家族全員が新しい保険に加入した。」 reports that the whole family enrolled in a new insurance plan. The change is completed in the sentence.
「組合への加入条件を窓口で確認した。」 describes checking membership requirements at a counter. Checking the conditions is not itself a completed enrollment.
Leaving a membership relationship
脱退 means withdrawal or secession. 「方針の違いから二人の会員が団体を脱退した。」 reports two members leaving an organization because of policy differences. Their withdrawal is stated.
「連盟からの脱退を総会で正式に決めた。」 reports a general meeting formally deciding to withdraw from a federation. A decision and a completed membership change are separate.
Membership rather than physical movement
組合への加入 points toward joining, while 団体を脱退した points toward leaving. The direction concerns a membership relationship rather than entry into or exit from a building.
Membership changes are not automatically identical to updating a registration or attending a single event. These sentences do not supply further insurance conditions or withdrawal procedures.
What membership directions appear in checking conditions for 加入 and in members completing 脱退?
Show the answer and why
加入 points toward entering membership, while 脱退 points toward leaving it. Checking requirements does not report completed enrollment, whereas the two members’ withdrawal is completed in its sentence.