Yes, checking is a Scrabble word!

Verb

1. Examine so as to determine accuracy, quality, or condition
2. Make an examination or investigation
3. Be careful or certain to do something; make certain of something
4. Lessen the intensity of; temper; hold in restraint; hold or keep within limits
5. Stop for a moment, as if out of uncertainty or caution
6. Put a check mark on or near or next to
7. Slow the growth or development of
8. Be verified or confirmed; pass inspection
9. Be compatible, similar or consistent; coincide in their characteristics
10. Block or impede (a player from the opposing team) in ice hockey
11. Develop (children's) behavior by instruction and practice; especially to teach self-control
12. Consign for shipment on a vehicle
13. Hand over something to somebody as for temporary safekeeping
14. Abandon the intended prey, turn, and pursue an inferior prey
15. Stop in a chase especially when scent is lost
16. Mark into squares or draw squares on; draw crossed lines on
17. Decline to initiate betting
18. Hold back, as of a danger or an enemy; check the expansion or influence of
19. Place into check
20. Write out a check on a bank account
21. Find out, learn, or determine with certainty, usually by making an inquiry or other effort
22. Verify by consulting a source or authority
23. Arrest the motion (of something) abruptly
24. Make cracks or chinks in
25. Become fractured; break or crack on the surface only