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"catching" is also used as a crossword clue. If that's what you saw, the answer is often infectious (10 letters).
Definitions
Grabbing, receiving, or becoming infected with something.
Used in a sentence
“Ah, who is this? You did not hear me, my young friend, did you? Why, you, too, look sad. My melancholy is not catching!”
“Bomb guy looked her up and down, not because he was an attractive man and she was possibly a catching woman.”
“Though catchings of the breath and occasional syncope appear in the more early stages, yet they only become considerable and dangerous in the later[…]”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Grabs hold”8 letters
02“Grabbing or contagious”8 letters
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