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застать врасплох stresses
gen.	catch someone by surprise; catch someone unawares (Despite George's vigilance the snow, when it did come, took him unawares. Franka_LV); take someone by surprise (Blackmirtl); catch someone off-guard (VLZ_58); surprise; steal up; walk in on (someone doing something: I walked in on friend's little brother as he was putting some of his mum's concealer powder on his butt.); catch someone flatfooted (His statement caught me flatfooted. Islet); catch someone on the back foot (felog); catch someone at a weak moment (Anglophile); catch someone off balance (Anglophile); wrong-foot (catch off balance; to take by surprise in disadvantaged position КГА); spring a surprise (on someone – кого-либо Anglophile); catch someone bending (кого-либо Anglophile); catch someone off guard (bookworm); sneak up on (someone: If you're not aware of the symptoms, this disease can sneak up on you. ART Vancouver); catch someone on the wrong foot (Franka_LV); take someone aback (surprise greatly; knock someone's socks off Franka_LV); take someone unawares (Despite George's vigilance the snow, when it did come, took him unawares. Franka_LV); nick; come upon (Faststone); blindside (Баян); come as a surprise (temcat); take aback (SergMesch); bring up short (КГА); walk in on (someone – кого-либо); take unprovided; take by surprise; catch off guard; catch unawares
amer.	have over the barrel; catch off base (Anglophile); bushwhack (I'm feeling a little bushwhacked here Taras)
fig.	catch sb napping (Franka_LV); catch sb off guard (Franka_LV)
idiom.	take aback (wisegirl); throw off balance (Баян); catch one with one's pants down (anadyakov); catch somebody cold (thefreedictionary.com moevot); knock over with a feather (aleks_lip); come out of left field (sankozh)
inf.	catch off-balance (Баян); catch someone with their pants down; catch by surprise (to happen unexpectedly Val_Ships)
media.	catch flatfooted (Andrew052)
slang	catch napping; catch one's slipping (в негативном значении: That fool from 387th street got caught slippin last night and was blasted. slayer044)
застать кого-либо врасплох
gen.	catch nodding; catch off his guard; take at a disadvantage; take short; catch on the wrong foot; catch napping; fall upon unawares; catch someone nodding; catch someone on the hop
Makarov.	catch off guard; catch on the hop; catch someone nodding; catch someone off his guard; take someone up short; have someone over a barrel
застать кого-л. врасплох
gen.	take one short; catch smb. off his guard
застать (кого-л.) врасплох
sl., teen.	caught with one's pants down (- Parents caught him with his pants down. - Предки буквально застали его врасплох. Vishera)

застать врасплох: 38 phrases in 10 subjects

Advertising	1
Boxing	1
Chess	1
Cliche / convention	1
General	14
Ice hockey	2
Law	1
Makarov	14
Politics	1
Psychology	2