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to fasten (something or someone) to; to tie (to); to fix; to bind
ロープで柱に括り付けた。
I tied it to the pillar with a rope.
自転車の後ろに荷物を括り付けて運んだ。
I tied the luggage to the back of the bike and carried it.
柱に括り付けないようにと言われた。
I was told not to tie it to the pillar.