Keep something for a sair fit.
"Keep something for a rainy day."—English.
Keep the feast till the feast day.
Keep the head and feet warm, and the rest will tak nae harm.
Keep the staff in your ain hand.
Keep woo, and it will be dirt; keep lint, and it will be silk.
"Lint mellows and improves by keeping, but wool rots."—Kelly.
Keep your ain fish-guts to your ain sea-maws.
"'Why, Mrs Heukbane,' said the woman of letters, pursing up her mouth, 'ye ken my gudeman likes to ride the expresses himsel—we maun gie our ain fish-guts to our ain sea-maws—it's a red half-guinea to him every time he munts his mear.'"—The Antiquary.