Verb

1. To exert much effort or energy
2. Test the limits of
3. Use to the utmost; exert vigorously or to full capacity
4. Separate by passing through a sieve or other straining device to separate out coarser elements
5. Cause to be tense and uneasy or nervous or anxious
6. Become stretched or tense or taut
7. Remove by passing through a filter
8. Rub through a strainer or process in an electric blender
9. Alter the shape of (something) by stress