in open sight; without tricks, concealment, or disguise:
Their actions are open and aboveboard.
Origin
1610-20;above + board; so called from the requirement of keeping the hands above the table or board in order to discourage possible cheating at cards
Synonyms
honest, straightforward.
Antonyms
devious, underhanded, sneaky.
British Dictionary definitions for above board
above board
adjective, adverb (aboveboard when prenominal)
1.
in the open; without dishonesty, concealment, or fraud
Word Origin and History for above board
aboveboard
adj.
1610s, from above and board (n.1). "A figurative expression borrowed from gamesters, who, when they put their hands under the table, are changing their cards." [Johnson]