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At someone's service fully available to help or to be of use to someone, or some organisation(¾î¶»°Ôµç µµ¿ÍÁÙ ¼ö ÀÖ´Â »óÅÂÀÎ): A member of the hotel staff was at our service during our stay.
At the bottom of the hour on the half hour(30ºÐ¿¡): I'll be back with more headlines at the bottom of the hour.
At the bottom of the ladder be at the lowest level of pay and status(¸Ç ¹Ø¹Ù´Ú¿¡¼ºÎÅÍ; ±Þ·á³ª ÁöÀ§°¡ °¡Àå ³·Àº ¼öÁØ¿¡¼): When Ann got fired, she had to start all over again at the bottom of the ladder.
At the coalface deal with the real problems and issues, rather than sitting in a office discussing things in a detached way(ÇöÀå¿¡¼): Many of the best ideas come from doctors at the coalface.
At the drop of a hat immediately(Áï°¢): The company can't expect me to move my home and family at the drop of a hat.