IDF
n. plural-only C1 Advanced idf
n. Stands for Israel Defense Forces. The military forces of Israel, responsible for the country's defense on land, at sea, and in the air.
n. Abbreviation for Israel Defense Forces. The national military of the State of Israel, comprising ground forces, an air force, and a navy. Typically takes a singular verb.
The IDF monitors the border closely.
After completing high school, many young Israelis are required to serve in the IDF for several years.
The organizational structure of the IDF is unique among modern militaries due to its heavy reliance on a large reserve force that can be mobilized within forty-eight hours.
Usage
Usually functions as a collective noun; takes a singular verb in American English and often a plural verb in British English.