spline /splīn/

1. A key to make a wheel and shaft revolve together
2. A thin strip or slat
3. A flexible instrument used in drawing curves

To put splines on

• old fogeys
• old fogy
• old-fogyish
• Old French
• old fruit
• old fustic
• old gang
• old-gentlemanly
• old girl
• Old Glory
• old gold
• old-growth
• old guard
• old guards
• old hand
• old hands
• Old Harry
• old-hat
• Old Hundred
• Old Hundredth
• old identities
• old identity
• oldie
• oldies
• oldish