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быть застигнутым врасплох stresses
gen.	be asleep at the switch (Anglophile); be caught off guard (Franka_LV); be caught napping; be caught short (МДА); be caught with one's trousers down; be off guard; be taken off one's guard; caught napping; caught off guard
Игорь Миг	be caught off guard by (чем-либо)
austral., slang	be caught with one's pants down
fig.	be caught napping
idiom.	be caught flat-footed (4uzhoj)
psychol.	have been taken aback (cnn.com Alex_Odeychuk)

быть застигнутым врасплох: 4 phrases in 4 subjects

Emphatic	1
Makarov	1
Mass media	1
Politics	1