Echelons : পর্যায়; স্তর;
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Appropriate Prepositions
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Dwell in (বাস করা): He dwells in a tall apartment.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Gift of the gab (বাকপটুতা): An advocate should have the gift of the gab.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.