tightlid
nounUK /ˈtaɪt.lɪd/
US /ˈtaɪt.lɪd/
A lid that fits very closely and does not let air or water in or out.
She screwed the tightlid onto the jar so the cookies would stay fresh.
OTHER MEANINGS
2. A person who keeps feelings or secrets hidden and does not share them.
He's a tightlid about his plans, so nobody knows what he'll do next.
3. A cover fastened so securely that it is hard to open.
The paint can had a tightlid that took two of us to pry off.
4. A strict limit or control on something, keeping it from spreading or escaping.
The new rules put a tightlid on noise after ten o'clock.