- (informal) To pay money, to disburse; especially, to pay a great deal of money.
- Do you think we should shell out for the extra options package?
2016 October 24, Owen Gibson, “Is the unthinkable happening – are people finally switching the football off?”, in The Guardian, London:
- BT shelled out almost £1bn for the Champions League over the same period, while the FA has just brought in around £820m over six seasons for the international rights to the FA Cup alone.
- (computing, especially Unix) To use a program's "shell escape" function to execute an unrelated command or to invoke a subsidiary, interactive shell.