1: Opposite of descend

5: Established beyond doubt or question; definitely known; 'It is ______ that they were on the bus.'

8: M

10: No longer known; irretrievable; a ______ art.

12: Clean diligently

15: Checkers opening?

16: This underground bulb is related to leeks, garlic, and chives and is known for its distinct, pungent and aroma.

17: Plural form of 'tell.'

18: Alternatives to Macs

19: Plural form of 'desk.'

20: Practice psychoanalysis?

22: Try to see, in a way

26: Draw air into, and expel out of, the lungs.

27: There were two ____ locked in the bike stand.

2: One-time electronics giant

3: A place where alcoholic drinks are served.

4: Antonym of 'sink.'

6: CD-__

7: A public promotion of some product or service.

9: Members of a military unit trained as shock troops for hit-and-run raids.

10: To have passed out from weakness, physical or emotional distress due to a loss of blood supply to the brain.

11: Pit viper with horny segments at the end of the tail that rattle when shaken.

12: A number that expresses the accomplishment of a team or an individual in a game or contest.

13: Long yellow fruits.

14: An expenditure, effort, or loss; 'It ______ more to live in the city.'

15: The naval officer in command of a military ship.

21: Large vessels for holding gases or liquids.

23: Malaria stopper

24: Blubber

25: A deciduous tree of the genus Quercus; has acorns and lobed leaves.