Definition of "half-open" []

• Partially open; ajar (adjective)
• (referring to an interval on the real line) containing only one of its endpoints (adjective)

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• "By matching the colored sphere on the left side with the ones on the right side, the user swaps between the four modes: open, half-open, closed and graph."
• "Something creaked outside the half-open door, and he jumped."
• "When I returned my gaze to Sebastian, his eyes were half-open and fixed on me in a quiet, unreadable way."