離脱

1. Origins, structure, and basic meaning

• Structure: The spelling is 離脱, read りだつ, and it combines 離, meaning separate, with 脱, meaning leave or break free.
• Basic usage: 離脱 is withdrawal from a group, organization, formation, or activity already in progress, including ending one's affiliation with it.

2. Common pitfalls and similar expressions

• Leaving a group midway and withdrawing from an organization
  • Both examples use the form 離脱した. It covers an athlete dropping out during an event because of injury and a member ending organizational affiliation over policy differences.
• An injured athlete and a member with a policy disagreement
  • けがをした選手が途中で集団から離脱した。 — The injured athlete dropped out of the group midway through the race.
  • 彼は方針の違いから団体を離脱した。 — He left the organization because of a disagreement over policy.