越冬 (えっとう) means overwintering. Both 越 (エツ) and 冬 (トウ) are on'yomi, forming a sokuon (促音) sound change. The small っ is essential; reading it as えつとう without the っ is incorrect, as is misreading 冬 as とい.
越冬 (えっとう) は冬を越すことを意味します。越 (エツ) と冬 (トウ) は音読みで、促音便 (っ) が生じます。「えつとう」のように「っ」を抜いたり、冬を「とい」と読むのは間違いです。
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