till; to; over (a period); through (e.g. Monday through Thursday); about (approx. time or place); on
concerning (an area of expertise)
swearing by (one's sword, God, etc.)
春から夏にかけて忙しくなる。
It gets busy from spring through summer.
今週から来週にかけて雨が続く。
Rain will continue from this week to next.
東京から大阪にかけて出張した。
I went on a business trip from Tokyo to Osaka.