Related Clues:

• Have faith in (with ''on'')
• Have confidence in (with ''on'')
• Door piece
• Opening and closing facilitator
• Swear by (with ''on'')
• Have a dependency
• Have confidence in (with "on")
• Pivotal factor
• Door joint
• "On that you can ___" ("As Time Goes By" lyric)
• Gate attachment
• Gate swinger
• Door pivot
• Rely (on)
• Venus' flytrap feature