as security—
1. as a pledge against possible financial loss:
- It is not unusual to require one or more partners to pledge their own property as security for a loan.
2. as a guarantee for the performance of some action:
- Three of the leading men were seized as security. The Mayor paid the sum and the “bonds” men were released.
for security—in order to ensure safety from possible harm:
- For security, the door was chained as well as locked.