Denshi Jisho — Online Japanese dictionary

着く つく 1: to arrive at; to reach;
2: to sit on; to sit at (e.g. the table)
Common word, Godan verb with ku ending 
着く はく 1: to put on (or wear) lower-body clothing (i.e. pants, skirt, etc.); to put on (or wear) footwear;
2: to affix a sword to one's hip;
3: to affix a bowstring to a bow
Godan verb with ku ending, Transitive verb 
着くや否や つくやいなや ... had hardly arrived before ...
Expression 
着くやいなや つくやいなや ... had hardly arrived before ...
Expression 

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