• Basic forms
• 競う — to compete; to vie / base form
• 競います — compete / masu form
• 競った — competed / ta form
• 競って — competing and … / te-form
• 競わない — do not compete / negative
• 競えば — if (they) compete / conditional
• 競え — compete! / imperative
• Common expressions
• 実力を競う — to compete in ability
• 記録を競う — to compete for a record
• More
• 互いに競う — compete with each other

競う（きそう） is a godan verb. It describes people or groups competing with one another, often in sports, contests, or performance.

• Basic forms
• 競る — to bid up; to vie over / base form
• 競ります — bid; vie / masu form
• 競った — was bid up / ta form
• 競って — bidding and … / te-form
• 競らない — do not bid / negative
• 競れば — if (it) is bid up / conditional
• 競れ — bid! (rare) / imperative
• Common expressions
• 値段が競る — the price is bid up
• 競りにかける — to put up for auction
• More
• 競り合う — to bid against each other

競る（せる） is an ichidan verb. It often refers to bidding or prices rising due to competition, especially in auctions or markets.