quword
趣词
Word Origins Dictionary
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
zero hour
[zero hour 词源字典]
"The time at which a planned operation, typically a military one, is set to begin", First World War: from
zero
+
hour
.
[zero hour etymology, zero hour origin, 英语词源]