in sports, a player who is used for part of a game instead of another:

US a teacher who replaces teachers who are absent from work:

a ship that can travel under water:

UK an amount of money that you pay regularly to be a member of an organization or club:

US a long, thin loaf of bread filled with meat or cheese, and often lettuce, tomatoes, etc:

[ I ] in sports, to play in a match in someone's place:

[ I ] US to do a job temporarily when someone else cannot do it:

[ T ] UK to replace one player with another during a game:

less than a number or level:

below or in a lower position:

almost or nearly:

being a smaller part of a larger whole:

not as good as:

less important or lower in rank: