1. in the sense of secure
- make certain
- make sure
- secure
- see to it
- warrant
- guarantee
- set the seal on
- certify
- confirm
- clinch
- verify
- check
- establish
- corroborate
- sew up
2. in the sense of protect
- protect
- safeguard
- shield
- guard
- fortify
- shelter
- assure
- make invulnerable
- make safe
- secure
- look after
- watch over
- take care of
Example Sentences of Ensure
1. They work hard to ensure safety.
2. I’ll ensure the project is completed.
3. Please ensure the door is locked.
4. We ensure customer satisfaction every time.