necessary, requisite, compulsory, necessary, indispensable, incumbent, important

bow with an iron chain with which athletes exercise

beyond time, timeless

consider necessary or right, deem indispensable

closely related to each other, reciprocated (or intimate) friendship, reciprocal, reciprocated, correlative, inseparable

closely related to each other, reciprocated (or intimate) friendship, reciprocal, reciprocated, correlative, inseparable

become necessary, be incumbent (on)

to be or become necessary (for), to follow of necessity, to be incumbent (on), to behove

make (something) incumbent or obligatory (on)

necessity, requisiteness, compulsion, adherence

unavoidable, compulsory, incumbent

binding, essential

essentially

declaring an inessential thing to be indispensable

from one thought to the other

Library: difference or objectionable sentence, or sign of missing letter or word

a good turn repaid by evil

intransitive verb

compulsory, indispensable part

right and proper

intransitive infinitive

to determine or settle to be right and proper, to justify, to vindicate

justifiable homicide

auspicious arrival or coming