A crossing or passage; the act or place of passing from one side to another (e.g. crossing a road, bridge or river).
橋の渡りで写真を撮った。
I took a picture on the span of the bridge.
夜間の渡りは危険だから、ライトを点けて進んでください。
Crossing at night is dangerous, so please proceed with a light on.
この小道の渡りは狭くて、人とすれ違うのが大変だ。
The crossing on this path is narrow, so it's hard to pass someone.
Importing; goods brought in from other regions or countries (a somewhat dated or specialized usage referring to imported items).
昔は渡りの魚が珍重され、市場で高値が付いた。
In the past, imported/migratory fish were prized and sold at high prices in the market.
Wandering; an itinerant person — someone who moves from place to place (e.g. itinerant performer or worker).
昔の渡りの芸人は各地を回って興行をした。
In the past, itinerant performers traveled around to put on shows.
渡りの職人としていくつもの村で仕事をしてきた。
As an itinerant craftsman, he has worked in many villages.
Migration — seasonal movement of animals or birds (e.g. migratory birds).
春の渡りで市の公園に多くの渡り鳥が立ち寄った。
During the spring migration, many migratory birds stopped by the city park.
渡りの時期には海辺で観察会が行われることが多い。
During migration season, seaside observation events are often held.
渡りのルートは年ごとに変わることもある。
Migration routes can change from year to year.
Contacts or connections (social/introductions). Often used in expressions like '渡りを付ける' meaning to arrange an introduction or connection for someone.
面接の前に先輩に渡りを付けてもらったので、話がスムーズに運んだ。
Because a senior arranged a connection for me before the interview, things went smoothly.
彼はその業界に渡りがあるから、有利に就職できた。
He was able to get a job advantageously because he had connections in that industry.
Go (board game) term: a 'watari' — a connection underneath the opponent's stones near the edge of the board that links groups. Often written in katakana (ワタリ).
この形はワタリが強いので、相手を包囲しやすい。
This shape has a strong watari, so it's easy to encircle the opponent.
Linguistics: a 'glide' — a semivowel sound that occurs between vowels (sometimes called a glide).
いくつかの言語では、母音間にワタリ（glide）が現れる。
In some languages, a glide appears between vowels.